1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 4 * James Leu (jleu@mindspring.net). 5 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 6 * Copyright (C) 2001 by various other people who didn't put their name here. 7 */ 8 9 #include <linux/init.h> 10 #include <linux/netdevice.h> 11 #include <net_kern.h> 12 #include "daemon.h" 13 14 struct daemon_init { 15 char *sock_type; 16 char *ctl_sock; 17 }; 18 19 static void daemon_init(struct net_device *dev, void *data) 20 { 21 struct uml_net_private *pri; 22 struct daemon_data *dpri; 23 struct daemon_init *init = data; 24 25 pri = netdev_priv(dev); 26 dpri = (struct daemon_data *) pri->user; 27 dpri->sock_type = init->sock_type; 28 dpri->ctl_sock = init->ctl_sock; 29 dpri->fd = -1; 30 dpri->control = -1; 31 dpri->dev = dev; 32 /* We will free this pointer. If it contains crap we're burned. */ 33 dpri->ctl_addr = NULL; 34 dpri->data_addr = NULL; 35 dpri->local_addr = NULL; 36 37 printk("daemon backend (uml_switch version %d) - %s:%s", 38 SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock); 39 printk("\n"); 40 } 41 42 static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) 43 { 44 return net_recvfrom(fd, skb_mac_header(skb), 45 skb->dev->mtu + ETH_HEADER_OTHER); 46 } 47 48 static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) 49 { 50 return daemon_user_write(fd, skb->data, skb->len, 51 (struct daemon_data *) &lp->user); 52 } 53 54 static const struct net_kern_info daemon_kern_info = { 55 .init = daemon_init, 56 .protocol = eth_protocol, 57 .read = daemon_read, 58 .write = daemon_write, 59 }; 60 61 static int daemon_setup(char *str, char **mac_out, void *data) 62 { 63 struct daemon_init *init = data; 64 char *remain; 65 66 *init = ((struct daemon_init) 67 { .sock_type = "unix", 68 .ctl_sock = "/tmp/uml.ctl" }); 69 70 remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock, 71 NULL); 72 if (remain != NULL) 73 printk(KERN_WARNING "daemon_setup : Ignoring data socket " 74 "specification\n"); 75 76 return 1; 77 } 78 79 static struct transport daemon_transport = { 80 .list = LIST_HEAD_INIT(daemon_transport.list), 81 .name = "daemon", 82 .setup = daemon_setup, 83 .user = &daemon_user_info, 84 .kern = &daemon_kern_info, 85 .private_size = sizeof(struct daemon_data), 86 .setup_size = sizeof(struct daemon_init), 87 }; 88 89 static int register_daemon(void) 90 { 91 register_transport(&daemon_transport); 92 return 0; 93 } 94 95 late_initcall(register_daemon); 96